For anyone wondering about the quality of this item, I can provide some information as I have the slightly earlier version, the C180. (I believe there is not a great deal of difference in the SQ, and the C190 has more balanced connections)
The Accuphase for me is a virtually perfect preamp. The sound is completely neutral with perhaps just a touch of warmth and tonal richness - but very slight. Where it excels is with its natural and in-depth presentation across all elements of a recording. You don't miss out on anything. The micro-dynamics are somehow enhanced and you hear things you might never have known were there. It's a wonderful three-dimensional wall of sound, perfectly balanced and suitable for all genres. It does not present music 'analytically' - it just presents it as 'real'.
I had some reservations spending so much money on a pre-amp. But after listening to it, I can't go back. It's an investment in stunning sound quality for life. Have a read of the reviews on the net, and even if you can't afford it save up for one as a great musical treat. You will not regret it. (I have no affiliation with the seller).